#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(n);++i)
#define all(a) (a).begin(),(a).end()
#define dunk(a) cout << (a) << endl
using namespace std;
typedef long long ll;

signed int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int a, b, s;
	cin >> a >> b >> s;

	int ans = 0;
	
	if (abs(a - s) <= abs(b - s)) {
		ans += abs(a - s) + s;
		a = 1;
		s = 1;
	}
	else {
		ans += abs(b - s) + s;
		b = 1;
		s = 1;
	}

	ans += abs(a - s);

	dunk(ans);

	return 0;
}